Selective call apparatus.



No. 795,836. PATENTED AUG. 1,1905.

J. A. HULIT. SELECTIVE CALL APPARATUS.

APPLIOATION FILED SEPT. 3. 1904.

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Inventor No. 795,836. PATBNTED'AUGA, 1905.

,J. A. HULIT'.

SELECTIVE GALL APPARATUS.

#PPLIOATIOH FILED 8BPT.'3. 1904.

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AIIH'ULIL SELECTIVE CALL APPARATUS. APPLIGATIOH mun 13221.3. 1004.

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No. 795,836. PATENTBD AUG. 1, 1-905.

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SELECTIVE CALL APPARATUS. APPLIGATION IILED'SEPT. 3, 1904.

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Witngsss Inventor WmM No. 795,836. PATENTED AUG. 1. 1905- J.A.HULIT. r

SELECTIVE CALL APPARATUS. APPLIOA-TIOE FILED sums. 1904.

5 SHEETS-SHEET 5 WJZnesses PATENT OFFICE.

JOHN A. HULiT, OF TOPEKA, KANSAS.

SELECTIVE CALL APPARATUS.

No. reaeee.

Specification of Letters Patent.

Patented Aug. 1, 1905.

Application filed September 3, 1904. Serial No. 223,237.

To aZZ whom it may concern:

Be it known that 1, JOHN A. HULIT, a citizen of the United States ofAmerica, residing at Topeka, in the county of Shawnee and State ofKansas, have invented new and useful Improvements in Selective CallApparatus, of which the following is a specification.

The invention relates to devicesvwhereby any one or group of stationsmay be called or signaled Without calling or signaling the otherstations on the same circuit, useful on telegraph-lines, party-linetelephone systems, and elsewhere. Such devices are usually operable bycombinations of short and long electrical impulses, dots, and dashes onthe main line, each station or group of stations being responsive onlyto a certain predetermined combination. As now constructed and used noprovision is made whereby a given station may be called eitherindividually or simultaneously with other stations at the will of thecalling operator, but each station must be called separately or with thegroup in which it is placed, even though it be desired to call it withsome other group or with only part of the group in which it is placed,or being included in a group no provision is made for calling it alone.It has been found unsatisfactory to place these devices on the maintelegraph-line on account of their liability to getout of order,especially from lightning, and thus not only destroy their ownusefulness, but also impair the entire circuit; but satisfaction hasbeen attained in this regard by including the instrument on a localcircuit controlled by the relay in the main line. Preference is forconnecting the local machine-circuit with the ordinary relay whichcontrols the local soundercircuit and controlling the machine-circuit bythe back contact of the relay, leaving the front contact to control thesounder-circuit in the usual manner. The dots and dashes by which themachine is operated are measured when the machine is included directly"in the main line by the length of time that the circuit remainsclosedthat is, to start a signal the main line is normally open and adot is made by closingthe circuit only momentarily and a dash is made bykeeping the circuit closed for a longer period of time, just as the dotsand dashes are measured in transmitting by the Morse method; but whenthe machine is placed on a local circuit controlled by the back contactof the relay, as above explained, the manner of measuring the dots anddashes is reversed, for when the main-line circuit is open the localmachine-circuit is closed and when the main-line circuit is closed thelocal machine-circuit is open. In other words, the dots and dashes mustbe measured by the length of time that the main-line circuit is openthatis, to start a signal to operate the machine the main line must benormally closed, and then a dot is made by opening the main linemomentarily and a dash is made by keeping the main line open for somelonger period of time, in which case the dots and dashes which operatethe machine are short and long spaces of the Morse system. Although, ofcourse, both front and back or down and up strokes must be made on thekey in either method of measurement, yet for convenience in reference Irefer to the first-described or ordinary method as dots and dashesproduced by the direct stroke or action of the telegraph transmittingkeyand to the latter method as dots and dashes produced by the back strokeor back action of the key.

Objects of my invention are to improve generally upon machines of thisgeneral nature and upon several of the parts thereof; to reduce thenumber of parts; to reduce friction; to simplify the mechanism; to avoidas far as possible the use of springs; to provide a machine of thisnature which may be controlled by the back contact of the relay and yetbe responsive to the dots and dashes produced by the direct stroke oraction of the key as distinguished from the back stroke or actionthereof; to provide mechanism in such a machine and so controlled, bywhich the ratchet may be progressed upon the closing of thetelegraph-key; to provide a ratchet in such a machine with mechanismwhereby a long stroke will progress all the ratchets on a line andwhereby a short stroke will return after explained and claimed.

The invention consists of the parts, im provements, and combinationsparticularly pointed out and claimed herein.

In the drawings accompanying and forming part of this specification andin the de scription thereof 1 illustrate the invention in its preferredform and show the best mode of applying the principles thereof; but itis to be understood that the invention itself is not confined to thedrawings and the description of the drawings, that it may be applied toother uses, and that parts and combinations thereof as specificallyclaimed may be used in connection with other devices of similar generalnature, and that 1 contemplate changes in form, proportion, material,arrangement, and the substitution of equivalent members withoutdeparting from the spirit of the invention.

In the drawings I have shown the invention as applied to atelegraph-line, the machine proper being controlled by the back contactof the relay-armature.

1n Figures 1, 2, 3, 4, 5, and8the main operating parts of the machineare'shown in normal positions, the telegraph-circuit being open and thelocal machine-circuit being closed. Fig. 1 is a vertical longitudinalsectional view of the machine proper, showing in side elevation thechief working parts of the machine, except the light coil-spring whichreturns the ratchet to normal position. This view is taken approximatelyon the line 1 1, Fig. 2. Fig. 2 is a plan View' thereof. The inclosingbox is shown in section in Figs. 1 and 2. Fig. 3 is a cross-sectionthrough the line 3 3, Fig. 1, none of the parts to the left of the line5 5 being shown, except that the main lever is shown in full. Fig. 1 isa companion view to and on the same elevation with Fig. 3, being takenon the line 1 4:, Fig. 1, and intended to show the tripping device whichis concealed from view in Fig. 3. Fig. 5 is a crosssection taken alongthe line 5 5, Fig. 1. Fig. 6 is a detail top view of the detachedbalancebar and its shaft, and Fig. 7 is a side view thereof. Fig. 8 isan end view of the machine within the main frame and is intendedspecially to show the balance-bar and the arrangement of the parts fromthe ratchet-wheel to the switch-operating lever, certain parts beingremoved or broken away. Figs. 9, 10, 11, and 12 are intended to show thelever action and the automatic throw-off for restoring the ratchet 'tonormal position. Fig. 9 shows the main lever in extreme low position andthe balance-bar in extreme high position, as when the main line has beenclosed and the machinecircuit opened. Fig. 10 shows the main lever inextreme high or normal position and the balance-bar in extreme lowposition, whichis assumed when the trip or short character or dot hasbeen sent to return the ratchet to normal position. Fig. 12 representsthe positions assumed by the levers and tripping device after the samesignal or character has been given, as in the case of Fig. 10, exceptthat in this figure the ratchet has been progressed far enough to bringa holding-pin under the balance-bar to prevent it from going to extremelow position and throwing ofi the holdingpawl. Fig. 11 is a side view ofthe ratchet, the pin therein, and a sectional view of the pin in thebalance-bar sustained thereon, all in the same positions as in Fig. 12,and is intended to show the relative positions of these parts, such viewbeing concealed in Fig. 12. Fig. 13 is a bottom view of the base withthe wiring. Figs. 14 and 15 are respectively enlarged detail end andside views of the pin in the ratchet-wheel. Figs. 16. 17, 18, and 19show the ratchet-wheels for four dilferent stations with the pinsselectively arranged therein and a sectional view of the pin whichsustains the balance-bar, it being understood that the individuality ispredetermined by the arrangement of these pins in the ratchet-wheel.Fig. 20 represents in diagram the preferred manner of the wiring andconnections at a station equipped with my call apparatus. In Figs. 21and 22 I show another manner of applying the principles of theinvention, the only substantial change being to pivot thepropelling-pawl directly on the main lever instead of on thebalance-bar, as in the preceding figures. Fig. 21 is aside elevation ofthe main features involved in the change; and Fig. 22 is a plan view,other parts not being shown. Fig. 23 is a diagram of another manner ofthe local wiring, the change being that here I use a single battery forthe sounder, machine, and calling-circuits, while in the precedingdiagram I show a battery for the local soundercircuit and anotherbattery for the machine and calling circuits.

Like letters and numerals of reference indicate like or correspondingparts throughout the several views.

Reference will first be made to the figures illustrating in diagram thelocal wiring.

In Fig. 20, ML represents the main-line wire of the telegraph-circuitpassing through a station, the remaining portions of the figurerepresenting the wiring and apparatus at that station. R is the relay, 9the armature, and 10 and 11 the front and back contacts, respectively.18 18 represent the local sounder-circuit, controlled by the frontcontact of the relay in the usual manner, and in which are included thelocal battery LB and the sounder S0 or other receiving instrument. K isthe usual key. Si represents any suitable local calling, signaling, orannunciating device, such as a light or a bell, or both. LB is a secondlocal battery, and M (shown in the dotted outline) represents themachine proper, which is to be hereinafter described in detail. 15, 16,and 17 are the binding-posts. S is a two-point switch contactingalternately with points 12 and 13, and EM is the electromagnet of themachine for controlling the switch S. The local wiring is variouslyindicated by the numerals 19 19, 2O 20. The machine-circuit may betraced, commencing with contact 11, thence through LB, 15, S, 12, 19,EM, 17, 19, and

four binding-posts 14 15 16 17.

9 to 11, which circuit is normally closed. If the switch S be shifted tocontact with point 13, then the local signal-circuit may be traced,commencing with point 13, thence through 16, 20, Si, LB, 15, and S to13, which circuit is normally open. The operation of the key closing andopening the circuit of the main line and operating the relay closes andopens the sounder-circuit in the usual manner by the front contact ofthe relay and, inversely, opens and closes the machine-circuit by theback contact of the relay. The purpose of the machine is to throw theswitch S to contact 13 upon the transmission over the main line of acombination of signals to which the machine is responsive in effectingthe shifting of the switch. When such combination has been transmitted,the switch S contacts with 13, thereby opening the machine-circuit andclosing the call-circuit and ringing the bell or lighting the lamp ordoing any other thing which it may be desired to do and which a machineof this general nature may be capable of doing. The kind of calling orother device to be controlled by the switch may be determined by thecircumstances of each installation. For instance, the ordinaryelectromagnetic bell may be used to sound an alarm. In large oifices,where the bells would be annoying, miniature lamps may be used, and thedevices may be located close to the relay,

as on the desk or on the wall of the room or,

at a distance, as at the operators home.

In Fig. 23 l have shown the parts ML, K,- R, 9, 10, 11, M, EM, S, 12,13, Si, and LB as in Fig. 20. The machine is provided with The localsounder-circuit may be traced, commencing with front contact 10, thencethrough 18, S0, 14, 18, 12, S, 17, LB, and 9 to 10, which circuit isnormally open. The local machinecircuit may be traced,-commencing withback contact-point 11, thence through 19, 15, EM, 19, 12, S, 17, LB, and9 to 11, which circuit is normally closed. The local signal-circuit maybe traced, commencing with contactpoint 13, thence through 16, Si, 20,LB, 17, S, to 13, which circuit is normally open. The operation of thekey has the same effect in this arrangement of the circuits as in thearrangement shown in Fig. 20; but when the switch S is shifted from 12to 13 to open the machine-circuit and close the call-circuit the localsounder-circuit is not affected in Fig. 20, while the localsounder-circuit is opened in Fig. 23. I

The remaining figures of the drawings are designed to illustrate themechanism whereby the switch S is shifted and whereby the switch isshifted at a certain station or group of stations and not at others. Inthese figures I have shown the machine provided with threebinding-posts, so as to be included in the arrangement shown in Fig. 20;but it is plain that it may in this respect be modified to meet anycondition or requirement.

B represents the base, ordinarily consisting of a suitable piece of hardwood, on which the machine proper is mounted, and A (shown in Figs. 1and 2 in section) is a suitable box inclosing the mechanism.

21 21 are the feet or pedestals on which the base may be supported.

Most of the parts of the machine are mounted between the upright platesor standards 23 23, which are supported on the base-plate 22 and heldrigidly and suitably spaced apart by the three separators or stay-rods24 24 24. At one end of the base-plate is mounted a lug or standard 27on a metallic plate 28, which is fastened to the base B by screws 29 29,one of which is connected by wire with the hinding-post 15, connectedwith the battery of the machine and calling circuit, as indicated in thediagram. The switch S, which is a fine spring-wire, is secured to thelug 27 by the plate 28, screwed into theside of the lug 27. Thecontact-point 12 consists of a metallic pin mounted in insulation 30 inthe lug 27, so as to be insulated from the switch S, and this point isconnected by suitable wiring with the electromagnet EM, which in turn iscon-- nected with the binding-post 17 of the machine-circuit. The point13 consists of a metallicpin in one end of a metallic lever 31, pivotedon a metallic shaft or spindle 32, pivoted in suitable bearingescrews101 101 in the metallic frame, which is connected by suitable wiringfrom screw 57 to binding-post 16 of the signal or call circuit. Normallythe switch S rests on the point or pin 12 and out of contact with thepin or point 13, thereby closing the machine-circuit and opening thecall-circuit; but upon moving the outer end of the lever 31 upwardly thepin 13 engages v the switch S and lifts it up off of the point or pin12, thereby opening the machine-circuit and closing the call-circuit Theinner arm of the lever 31 is providec with a laterally-extending pin 33,which rests normally on an upright pin 34, secured to a rock-shaft 35,which is also provided with a long controlling-rod 36 and a tailrod 37,which serves as a weight to return the rock shaft and its pin and rod tonormal position. The lever 31 is so disposed that the inner armoverbalances the rear or outer arm. Consequently if the rod 36 be turnedto the left,

Fig. 1, to throw the pin 34 away from under.

the pin 33 the inner arm of the lever 31 will fall down on the shaft 35and the outer arm will be elevated with the efiect of shifting theswitch, as described. To return the lever 31 to normal position afterithas been shifted as above described, I employ an arm 38 onarod 39,mounted in the opposite sides of the frame, the ends being bent to holdit in position, one of the ends being long enough to serve as a handle,and a tail-rod 4O resting normally on the lug 41 of the box A. Byturning the handle upward the arm 38 will depress the outer arm of thelever 31 and raise the inner arm, permitting the weight-arm 37 to carrythe rock-shaft and its pin and rod to normal position and restoring theswitch S to normal position. To throw the rod 36, I employ the deviceshereinafter described.

On a shaft 41, pivoted between the frameplates 23 23, are secured aratchet-wheel 42, an arm 43, and one end of a lightspiralspring 16, theother end of which is fastened to a post 47 in the adjacent plate 23.The ratchetwheel has a pin 14, which engages a pin 15 in the adjacentplate 23 when the ratchet-wheel is in initial or normal position, asshown. The purpose of the pins is to stop the ratchetwheel on itsbackward or return movement, it being understood that the wheel isactuated in its forward movement by the propelling devices hereinafterdescribed and inits return movement by the spring 16. The rod 36 extendsinto the path of the arm 43, which is elbow-shaped, so that as the shaft11 is actuated by the ratchet wheel 4:2,and with it the arm 43, said armat a certain point moves the rod 36 far enough to throw the pin 33 awayfrom under the pin 31, thereby opening the machine-circuit and closingthe call-circuit. As shown in these drawings, the arrangement is suchthat the wheel must be progressed twelve notches from its initial ornormal position in order to throw the pin to shift the switch, asdescribed.

On a shaft 60, also pivoted between the two frame-plates, is the mainpropelling or operating lever L, consisting of the vertical bar 62, towhich is secured the armature-bar 63 and the horizontal rod 61, to thefree end of which is pivoted the pawl 65, whose back motion is limitedby a pin 65. The parts 61 and 62 are rigidly secured together, thisshape being preferred because of the compactness attainable in thearrangement of the electromagnets.

The two members of the electromagnet EM may be secured to the heel-plate59 on the lug 19, which is fastened to the base-plate of the frame, anda buffer 6 1, which is also fastened to the base-plate, may be providedfor the bar 62. This arrangement of the electromagnet and the armatureand main propelling-lever is such that when the magnets are energized,as when the circuit is closed, the lever is held suspended and away fromengagement with the other mechanism; but when the circuit is broken therod 61 and pawl 65 fall of their own weight.

shaft and connected with the bar 66 by the lug 67 is abar 67, which hasa single notch 68 and a shoulder 70, the face of the notch beingslanting, so as to permit the shoulder to throw the pawl 65 out of saidnotch at the proper time, as hereinafter explained. Also secured on theshaft 66 is a block 71, in which is pivoted the propelling-pawl 7 1 andin which is secured the rest 72 for the pawl. The balance-bar and theparts secured thereto are so adjusted or balanced on the pivots that thelong or inner arm slightly overbalances the other arm, so that itsaction will be comparatively slow.

Normally, the magnet being-energized, the main operating-lever and thebalance-bar are in the positions shown in Fig. 1. Upon the main circuitbeing closed and the machine-circuit being thereby opened, releasing thearmature, the rod 61 falls of its own weight, and the pawl 65 engagingthe notch 68 carries the rear arm of the balance-bar down with it,thereby raising the forward or inner arm. At a point shown by the dottedoutline in Fig. 21 the shoulder 70 strikes the pawl 65 and throws it outof the notch 68, this being permitted by reason of the face 69 at aboutthis point being about horizontal or sloping slightly to the rear. Themain bar drops to the position shown in Fig. 9, being retarded somewhatin its fall by the rather sluggish action of the balance-bar, till it(the main lever) rests on the stay-rod 2 1. The balancebar is thrownagainst the buffer 25, which action has brought the propelling-pawl 7 1into engagement with the teeth of the ratchetwheel and progressed thewheel a distance of one tooth, whence the balance-bar will return to itsnormal position by its own weight, falling at first slowly and at lastfast, and the main lever may be returned to its normal position byopening the main line and closing the machine-circuit, thus energizingthe electromagnet, which draws to it the armature of the main lever. Itis now plain that if this operation of closing and opening the mainlinecircuit be continued eleven more times the ratchet would be progressedtwelve notches, thereby shifting the switch S, as described, in theabsence of the operation of devices for throwing off the holding-paw].As a holding-pawl for the ratchet-wheel I provide a shaft 75, pivotedbetween the frameplates 23 23, and through said shaftI inserta stiffwire bent into proper shape to form the holding-pawl proper, 73, and thetail-rod 76, which latter tends to keep the former in constantengagement with the teeth of the ratchetwheel.

I provide two means for throwing off the holding-pawl, so as to permitthe spring to return the ratchet-wheel to normal or initial position.The first means is to be operated by hand and merely consists of the pin77, extending laterally from the inner end of the lever 31 and engagingthe under side of the tail-rod 76, so that as the inner arm of saidlever is thrown upward in returning it to normal position by the rod 39and arm 38 the pin 77 also throws up the tail-rod 76, thereby throwingoff the holding-pawl and permitting the spring to return theratchet-wheel. This means is to be employed after the station has beencalled and the operator at the called station restores the callapparatus to normal position ready for the next call. The second meansis automatic and described as follows: Through the balance-bar 66 issecured a rod the upper end of which is bent over toward theratchet-wheel to form a pin 79, (which need not be considered atpresent,) while the other end is extended downwardly and rearwardly tothe holding-pawl 73, so that when the bar 66 is in normal positon, as

shown in Fig; 1, the end of the rod 78 will not operatively engage theholding-pawl and so that when the balance-bar is permitted to fall toits extreme low position, as shown in Fig. 10, the lower end of the rod78 will enplates 23 23, which shaft also has a tail-rod 83 and acontrolling-rod 84. The tail-rod is heavy enough to carry the shaft andother parts secured thereto to the position shown in Fig. 10, when bothof the other rods are released, said tail-rod then resting on the lug49. In this position the support 81 is carried out of the path of thepin 80, thus permitting the balance-bar 66 to fall until it rests onshaft 82, Fig. 10. The rod 85, pending from the main lever, engages withthe controllingrod 84 when the lever is in extreme low position, asshown in Fig. 9, but is free therefrom when the bar is in elevated ornormal position, as shown in the other drawings. Thus the supporting-rod81 is held in normal position either by the weight of the balancebar,whose pin 80 rests in the slight depression at the top of said rod, orby the main lever, whose rod 85 engages the rod 84: when the main leveris in low position. The buffer 26 prevents the tripper from being throwntoo far back. a

The operation of the tripper is' as follows: Assuming the parts to be innormal position, as shown in Fig. 1, if the machine-circuit be opened,permitting the main lever to fall, and thereby carry the forward arm ofthe balance-bar up, the tripper is first released from the pin 80 andthen brought back to normal position by the rod 85, and if the cirsteadof keeping the circuit through the elec tromagnet open for such a longperiod of time as is required for the operation ust described thecircuit be opened only momen tarily by such action on the main line asis ordinarily intended for a dot, the main lever would fall only a veryshort distance, being retarded by engaging the balance-bar, and thebalance-bar would not be thrown up to vertical position or far enough toprogress the ratchet, but only far enough to barely raise the pin out ofthe depression or perhaps a little higher, which would release thetripper, which would be carried out of the path of the pin 80, asheretofore explained, and

thus permit the balance-bar upon the imme' diate raising of the mainlever by energizing the electromagnet to fall to its extreme lowposition, as shown in Fig. 10, thereby throwing off the holding-pawl 73and permitting the spring to restore the ratchet to normal positionfromall which it is evident that a dot or short impulse on the main linewill restore the ratchet to normal position and that a long signal or adash will progress the ratchet one notch. Although the machine may beadjusted so as to be operable by the ordinary dots and'dashes of theMorse alphabet, yet I prefer in the form shown in the drawings to adjustthe parts so that the dash required to progress the ratchet withoutthrowing off the holding-pawl shall be somewhat longer than the dash ofthe ordinary Morse sending. The purpose is so that the ordinary Morsesignals may be sent over the line without progressing the ratchet andultimately without intention operating one of the machines.

All the shafts which are pivoted between the upright plates 23-23 arehung in suitable cup-bearing screws 101 101.

We now come to the means whereby the device may be rendered selective orindividual, which consists principally of pins selectively arranged inthe ratchet so as to render the trip device at times inefiective tothrow off the holding-pawl, and herel may state that 1 am fully awarethat in other machines pins have been arranged in the ratchet to operateas trip devices; but I am not aware that they have been employed inconnection with the devices now to be described so as to operate not astrippers but rather as means for rendering another trip deviceineffective. A pin 90 projects from the side of the ratchet-wheel and inthe path of the pin 79, which extends from the balance-bar.

In Fig. l the pin 90 is shown as located opposite the fourth notch fromthe notch which is opposite the pin 79. In other words, the pin 90 is solocated that when the ratchet has progressed four notches thebalance-bar in returning from the extreme high position toward normalposition after having progressed the ratchet the fourth successive timewill fall with the pin 79 resting on the pin 90, thus holding the entirebalance-bar, and especially the pin 80, above the tripping device, sothat when the main lever is raised to normal position the tripper willfall to position shown in Fig. 12; yet the balance-bar will not throwoff the holding-pawl, because it is sustained away from the trip deviceby reason of its pin 79 falling on the pin 90, as described, and if thenext signal be a dot it is plain that such a dot will not have theeffect of either progressing the ratchet or of re-,

turning it to normal position, and if the dot be followed by eight moredashes the call will be made. If, however, there be two machines on thesame circuit, each connected up as herein set forth and provided withthe mechanism herein described, except that the first machine has thepin at the fourth, as shown, and the ratchet of the second machine haveno pin at all, it is quite evident that if in a succession of twelvedashes a dot be inserted between the fourth and fifth dashes the effectwould be to return the second machine to initial position by the dot andcall the first machine at the end of the twelfth dash, and it would alsobe clear that if the second machine had a pin at the fifth notch asuccession of twelve dashes would call both machines, a succession oftwelve dashes with a dot between the fourth and fifth dashes would callthe first machine, and a succession of twelve dashes with a dot betweenthe fifth and sixth dashes would call the second machine only. It isalso clear that if a dot be made elsewhere than between the fourth andfifth or between the fifth and sixth dashes neither machine will becalled.

In Figs. 16 to 19, inclusive, I have illustrated the arrangements ofpins for four selective calling devices. It is to be understood that themachines at all stations are alike except as to the arrangements ofthese pins 90. In Fig. 16 pins are located at the fifth and seventhnotches, in Fig. 17 at the fifth and sixth notches, in Fig. 18 at thefourth and seventh notches, and in Fig. 19 at the fourth and sixthnotches. The relative arrangements of the pins on the several ratchetsmay be tabulated as follows, the first horizontal line indicating thefigure of the drawing and the first column on the left indicating thenumber of the notch, N indicating that there is not and P indicatingthat there is a pin opposite the designated notch of the designatedratchet:

zzzzzezezzzz;

zzzzzzeezzazs zzzzzwzzezzzs zzzzzzezwzzzs Station or stations 11Combination.

5 dashes, dot, 2 (lasl1es.dot, 5 dashes. 5 dashes. dot, 1 dash, dot, 6dashes.

4 dashes, (lot, 3 dashes, dot, 5 dashes. 4 dashes, dot, 2 dashes, (lot,6 dashes. 5 dashes. dot, 7 clashes.

7 dashes, dot, 5 (lashes.

6 dashes, dot, 6 dashes.

4 dashes. dot, 8 dashes.

12 dashes.

Allstations The purpose of the four preliminary notches without pins isthat in ordinary telegraphing a slow operator might make a number oflong dashes without the intention of calling; but he is not liable tomake as many as four such successively, and therefore as the dots sofrequently intervene the dashes in ordinary Morse and as even the Morseclashes are intended to have the effect of throwing ofi theholding-pawls all the instruments are ordinarily kept in about normalposition. 'Of course if the devices are to be used on a partylinetelephone system the necessity of the preliminary notches will notexist. Hence the use of four as an exact number is arbitrary and may bealtered to suit any condition or dispensed with. The purpose in havingthe twelve notches to close the call-circuit is that with this number Iam enabled to place sixteen stations on a single line with the fourpreliminary safety-notches without pins, so that each station may becalled individually and so that all may be called simultaneously and sothat they may be called in various groups, all at the will of thecalling operator, as indicated by the following table, in which the planof the above table is followed:

The combination necessary to call individually any particular stationmay be readily ascertained by taking the column under that station,substituting a dash for each letter,

(both for the PS and for the Ns,) and then inserting a dot after eachdash which is snbstitutedfor the PS. All the stations will be called bymaking the twelve successive dashes with no intervening dots, and thestations may be called in groups by arranging them as aboveexplained. Ofcourse this arrangement is an ideal one, and there is probably noinstance where this exact arrangement might be applicable; but it servesperhaps better to illustrate the principles of my invention than a morepractical division or grouping and will aid any one in installing asystem in arranging the pins and combinations.

If more stations are to be included in the line,

94 above and below the pawl limit its motion;

In this form the main lever should be bent over to one side of thewheel, as at 91, to bring the pawl 92 into engagement with theratchet-wheel, and the order of the parts of the balance-bar and thetrip should be modified accordingly, as clearly shown in Figs. 21,

and 22. The parts are so adjusted that the pawl 92 engages the tooth ofthe ratchet just as the pawl 65 is thrown from the notch 68, asindicated by the dotted outline in Fig. 21, which allows the full weightof the main lever to fall on the ratchet-wheel, so as to progress it onenotch.

From the foregoing description it is now apparent that when my inventionis embodied in the form shown in the drawings and connected up astherein set forth, so as to be controlled by the back contact of therelay, the dots and dashes necessary to operate the machine are the dotsand dashes produced by the direct stroke or action of thetransmittingkey as distinguished from the back stroke or action thereof,as heretofore explained.

It is also now clear that when the machinecircuit is closed, as innormal condition, the

main operating-lever is held suspended by the electromagnet away fromthe ratchet and that upon opening the machine-circuit by closing themain-line circuit the main lever is simply permitted to fall by theforce of gravity, which causes the propelling of the entire machine.Whereas in former machines of this nature the electromagnet has had theeffect when energized of either drawing or permitting or causing thepropelling-lever to fall to the ratchet, in any of which cases theelectromagnet has had to draw against the tension of a retractllespring, in my machine I use only the two forces of the electromagnet andof gravity, eliminating the spring.

Another important element of my invention is that whereas in formermachines any and all actions of the machine have the effect ofprogressing the ratchet one or more notches in my machine it is only thedashes that progress it, and the dots either do not progress it orreturn it to normal.

The features stated in the last two paragraphs are of importance becauseof the fact that a weak current will operate the machine, whileastronger current would be required to draw the main lever or thearmature controlling it against the tension of a retractile spring andto progress the ratchet each time that either a dot or a dash was. madeon the main line. Also by using a trip device for the holding-pawlthrow-off, controlled by the main lever, and using the pins on theratchet for rendering the trip device at times inetfect ive instead ofusing the pins themselves as the trip devices, it is to be seen that thenumber of pins necessary in a series of the machines and-break method Ihave found that the total length of the spaces considerably exceeds thetotal length of the dots and dashes-that is, that the main line is openmore than it is closed, and consequently the armature of the relayengages more with the back contact than with the front contact, thuskeeping the machine-circuit, which is controlled by the back contact,closed a majority of the time. In former machines using theelectromagnet and main propelling-lever and controlled by" thebackcontact of the relay the bar has been engaged with the ratchet, whilethe local machine-circuit has been closed and disengaged therefrom,while the local machine-circuit has been open, while in my machine theoperation is reversed. Therefore in former ma chine, asthe,machine-circuit is closed more than it is open, the sending of theusual Morse signals over the line will keep the main lever in engagementwith the ratchet more than disengaged therefrom, while in my machine thelever is kept away from the ratchet more A than in engagement therewith.The results are, in connection with the mechanism employed in mymachine, that whereas in former machine the ratchets have beencontinuously progressed and returned by both dots and dashes in mymachine the dots do not progress the machine-ratchet and even the dashesof the Morse signal may return the ratchets, and consequently theratchets are retained all the time in approximately normal position.This is a matter of considerable importance in view of the fact that themachine is affected by every dot and dash sent over the line.

What I claim is 1. The combination with the relay and the localsounder-circuit including a battery and a sounder controlled by thefront contact of the relay; of the selectivecall machine-circuitcontrolled by the back contact of the relay and including anotherbattery and an electromagnet; a signal-circuit including a signal deviceand the second-named battery; and the two-point switch selectivelyoperable by the f electromagnet for opening the machine-circuit andclosing the signal-circuit.

2. The combination of the relay and the local sounder-circuitincludingthe battery and the sounder controlled by the front contact of therelay; the selective-call machine-circuit including another battery andan electromagnet; a signal-circuit including a signal device and thesecond-named battery; a two-point switch for opening the machine-circuitand closing the signal-circuit; a switch-operating lever; a ratchet tooperate said lever and propelling and holding pawls for the ratchet; themain propelling-lever controlled by the electromagnet and adapted toactuate the propelling-pawl; a balance-bar actuated by the main leverand actuating the holding-pawl; a trip device controlled by the mainlever for controlling the action of the balance-bar with relation to theholding-pawl; and pins selectively arranged in the ratchet for renderingthe trip device ineffective.

3. The combination of the circuit including the battery and theelectromagnet; the circuit including the signal device and said battery;the two-point switch for opening the firstmentioned circuit and closingthe signal-circuit; a switch-operating lever; a ratchet to operate saidlever and propelling and holding pawls for the ratchet; the mainpropellinglever controlled by the electromagnet; a balance-bar actuatedby the main lever and actuating the holding-pawl; a trip devicecontrolled by the main lever for controlling the action of thebalance-bar with relation to the holding-pawl; and pins selectivelyarranged in the ratchet for rendering the trip device at timesineffective.

4. The combination of the switch-shifting ratchet and the propelling andholding pawls therefor; the circuit including a battery and anelectromagnet; the propelling-lever controlled by the electromagnet;together with suitable mechanism whereby a long stroke of the lever willprogress the ratchet without throwing off the holding-pawl, and a shortstroke will throw off the holding-pawl without progressing the ratchet.

5. The combination of the circuit including a battery and anelectromagnet; a switchshifting ratchet and means tending to force it toinitial position and propelling and holding pawls therefor; the mainlever controlled by the electromagnet to actuate the balancebar and tocontrol its action with relation to the holding-pawl; the balance-bar toactuate the holding-pawl; and the pins selectively arranged in theratchet and engaging the balance-bar to render the control of the mainbar over the balance-bar as to the holding-pawl ineifective.

6. The combination with the circuit including a battery and anelectromagnet; of the ratchet; the balance-bar; the main propellinglevercontrolled by the electromagnet; the propelling-pawl actuated by themain lever; the holding-pawl; and a trip-support for the balance-baradapted in one position to sustain the bar away from the holding-pawl,and in another position to permit the bar to throw off the holding-pawl.

7. The combination of the circuit including a battery and anelectromagnet; the ratchet and propelling and holding pawls therefor;the main propelling-lever controlled by the electromagnet; thebalance-bar operated by the main lever and adapted at times to throw oithe holding-pawl; the tripping device controlled by the main lever tocontrol the action of the balance-bar with relation to the holding-pawl.

8. The combination with the electric circuit including a battery and anelectromagnet; of the ratchet and the propelling and holding pawlstherefor; the main propelling-lever controlled by the electromagnet andcontrolling the propelling-pawl; the balance-bar operated by the mainlever and adapted at times to throw off the holding-pawl; and the tripdevice to control the action of the balance-bar with relation to theholding-pawl.

9. The combination with the circuit including a battery and anelectromagnet; of the main propelling-lever controlled thereby; aswitch-operating ratchet and propelling and holding pawls thereforadapted to be operated by the main lever; the balance-bar operable bythe main lever and adapted to engage the holding-pawl; a trip devicecontrolled by the main lever and adapted in one position to keep the barfree from the holding-pawl, and in another position to engage said pawlby said bar to throw 01f said pawl; and means selectively arranged forrendering said trip device ineffective for engaging said pawl to throwit 011'.

10. The combination of the circuit including a battery and anelectromagnet; a switchshifting ratchet and propelling and holding pawlstherefor; a main propelling-lever and a balance-bar, operable bytheelectromagnet and operating the pawls; a trip device controlled bythe main lever and adapted to control the'action of the balance-bar withrelation to the holding-pawl; and devices selectively arranged to renderthe trip device ineffective.

11. The combination of the main lever; the ratchet and holding andpropelling pawls therefor; the balance-bar between the main lever andthe pawls; the trip device controlled by the main lever for controllingthe action of the balance-bar with relation to the holding-pawl; and thepins selectively arranged in the ratchet to render the trip device attimes ineffective.

12. The combination of the circuit including the battery and theelectromagnet; a switch-operating ratchetand propelling and holdingpawls therefor; a main propellinglever controlled by the electromagnet;a balance-bar actuated by the main lever and actuating the pawls; a tripdevice controlled by the main. lever for controlling the action of thebalance-bar with relation to the holdingpawl; and pins selectivelyarranged in the ratchet for rendering said trip device ineffective.

13. The combination of the main propelling-lever; the ratchet andpropelling and holding pawls therefor; the balance-bar actuated by themain lever and itself actuating at times the holding-pawl; the tripdevice controlled by the main lever to control the action of thebalance-bar with relation to the holding-pawl; and pins selectivelyarranged in the ratchet for rendering the trip device ineffective.

14. The combination of the circuit including a battery and anelectromagnet; the main propelling-lever having the pawl 65; thebalance-bar having the notch and the shoulder to engage the pawl and tothrow it and free the bar from the main lever and permit the independentreturn of the bar.

15. The combination of the main propelling-lever and the balance-barheld normally in an approximately horizontal position, but being adaptedto be thrown by the main lever to approximately vertical position and tobe returned by the force of gravity and independently of the return ofthe main lever.

ranged in the'ratchet to render the trip device at times inefiective.

17. The combination of the main propellinglever; the ratchet withpropelling and holding pawls therefor; the balance-bar between the mainlever and the holding-pawl; the trip device controlled by the main leverfor controlling the action of the balance-bar with relation to theholding-pawl; and the devices selectively arranged to render said tripdevice at times ineffective and to prevent the balancebar from throwingoff the holding-pawl.

18. The combination of the switch-shifting ratchet and holding andpropelling pawls therefor; devices for actuating the pawls; a tripdevice for controlling the action of the holding-pawl-actuating devicewith relation to said pawl; and pins selectively arranged in the ratchetto render the trip device at times ineffective.

19, The combination of the switch-shifting ratchet and the propellingand holding pawls therefor; devices for operating the propellingpawl,and also for throwing off the holdingpawl without progressing theratchet; a trip device for controlling the holding-pawl throwoff; anddevices selectively arranged to render the trip device ineffective.

20. The combination of the ratchet and the operating devices and aholding-pawl therefor, said pawl having a tail-rod; a switch; a switchoperating lever having two pins extending laterally therefrom to engage,respectively, the said tail-rod and a supporting-pin; a rockshafthaving-a tail-rod, a supporting-pin, and a controlling-rod engaged bythe ratchet.

21. The combination of the ratchet and operating devices and aholding-pawl therefor; a switch; a switch-operating lever and a supporttherefor; the ratchet being adapted to throw the support to permit thelever to shif the switch.

22. The combination of the switch; the ratchet and propelling devicesand a holdingpawl therefor; the switch-controlling lever intermediatethe ratchet and the switch, and adapted to restore the switch and throwoif the holding-pawl simultaneously.

23. The combination of the switch; the switch-shifting ratchet andpropelling and holding pawls therefor; the devices for automaticallyrestoring the ratchet to initial position; and the devices for manuallyrestoring the switch and the ratchet to initial positionssimultaneously.

24. The combination of the ratchet with propelling devices and aholding-pawl therefor; a throw-off for the holding-pawl; a trip devicefor the throw-off; and pins selectively arranged in the ratchet tosustain the throwoff free from the trip device and thus to render thetrip device at times ineffective.

25. The combination of a series of ratchets, propelling devices andholding-pawls therefor; a throw-off for each holding-pawl; a trip devicefor each throw-off; and pins selectively arranged in each ratchet forsustaining the throw-off free from the trip device to render the tripdevice at times inefiective; whereby the simultaneousoperation of allthe trip devices may throw off some of the holding-pawls and not affectthe others.

26. The combination of themain propellinglever, the balance-bar, and theratchet; the main lever being adapted to engage with the balance-bar inits action toward the ratchet so as to be retarded thereby, beforepropelling the ratchet.

27. The combination of the main propellinglever, the balance-bar, andthe ratchet; the main lever being adapted to engage initially with thebalance-bar in its propelling stroke.

28. The combination with the relay of the main telegraph-circuit and thecircuit con trolled by the back contact thereof and including a battery;of the device comprising the switch-shifting ratchet and push andretaining pawls therefor, a propelling-lever to actuate the push-pawl,and an electromagnet to actuate the propelling-lever and included in thesecond-named circuit; said switch-shifting device being selectivelyoperated by the dots and dashes produced by the direct action of thetelegraph-transmitter as set forth.

29. The combination of the relay and the circuit controlled by the backcontact thereof and including a battery and an electromagnet; asignal-circuit including a battery, a signal device, and a switch; aratchet for controlling the switch; and a balance-bar and a mainpropelling-lever controlled and actuated by the electromagnet, saidlever being actuated in one direction by gravity and in the other by theenergized electromagnet.

30. Thecombinationofthemainpropellinglever; the ratchet and propellingand holding pawls therefor; the pivoted oscillating balance-barintermediate the main lever and the propelling-pawl actuated in onedirection to propel the ratchet by the main lever and returnable bygravity independently of the return of the main lever.

31. The combination of the circuit including a battery and anelectromagnet; a main propelling-lever controlled by the electromagnet;a switch-shifting ratchet; a balance-bar intermediate the main lever andthe holdingpawl and acting as a throw-ofl for the holding-pawl; the pushand holding pawls; and the devices selectively arranged to prevent thebalance-bar at times from throwing oif the holding-pawl.

32. In a system of electric selective calls of the kind described, aseries of ratchets with propelling and retracting devices therefor andsuitable means whereby a certain signal will progress all the ratchetsand another certain signal will -retract them; together with devicesselectively arranged for each ratchet for preventing, at selected times,the retraction of that ratchet notwithstanding the operation of thesecond-named signal.

33. The combination of the circuitincluding a battery and anelectromagnet; a switcl1shifting ratchet and the propelling and holdingpawls therefor; the balance-bar to actuate the holding-pawl; the mainpropelling-lever controlled by the electromagnet to actuate thebalance-bar and to control its action with relation to the holding-pawl;and the devices cooperating with the ratchet and selectively arranged toprevent the balance bar from throwing off the holding-pawlnotwithstanding the action of the main lever normally having thateffect.

34. The combination of the ratchet and propelling and holding pawlstherefor; the balance-bar to throw oif the holding-pawl; a trip deviceto control the action of the balance-bar with relation to theholding-pawl; actuating mechanism for the bar and the propellingpawl;and devices selectively arranged in the ratchet to render the tripdevice at times ineffective.

35. The combination of a series of ratchets, propelling devices andholding-pawls therefor; throw-offs for the holding-pawls means foroperating all the throw-offs in concert; and selective devices for eachratchet for rendering the operation of said throw-offs at timesineffective.

36. The combination of a series of ratchets and propelling devices andholding pawls therefor; a throw-off for each holding-pawl; means fornormally operating all of the throwoifs in concert; and devicesselectively arranged for each ratchet for preventing the throwing off ofthe holding-pawl.

37. The combination of a series of ratchets and propelling devices andholding -pawls therefor; means for progressing all the ratchets inconcert by one certain signal, and for retracting them by anothercertain signal; and devices cooperating with each ratchet andselectively arranged for preventing the retraction of the said ratchetnotwithstanding the said second-named signal.

38. In a system of electric selective calls of the kind described, theseries of switch-shifting ratchets, the propelling devices andholding-pawls, therefor, together with suitable mechanism whereby acertain signal will progress all the ratchets, and another certainsignal will normally return them, and devices selectively arranged foreach ratchet for pre venting the return of that ratchet notwithstandingthe operation of the return-signal; in which construction each stationmay be called individually and in concert with others, and in which asuccession of the ratchet-progressingsign als, without theratchet-returning signals, will call all the stations.

39. In a system of electric selective calls of the kind described, aseries of ratchets with propelling devices and holding-pawls thereforand a throw-off for each holding-pawl; mechanism whereby acertain signalwill pro gress all the ratchets and another certain signal will normallythrow ofi the holding-pawls and return all ratchets to initialpositions; In testimony whereof I have hereunto set and devicesselectively arranged for each my hand in the presence of two Witnesses.ratchet for preventing the return of the ratchet notwithstanding theoperation of the throwv JOHN HULIT' ing-oft" signal; whereby the severalstations Witnesses:

may be called individually and in groups at 1. L. BETZER,

the will of the calling operator. 1 SIDNEY SMITH.

